Grate structure



June 1 1926.

L. E. BUDD GRATE STRUCTURE 4 Sheets -Sheet l Filed March 6, 1925 III/III W WITNESSES INVENTOR Zeal?! Efiadd 1/15 AT7:,0RIVEY June -1 1926.

L. E. BUDD GRATE STRUCTURE 7 Filed March s, 1925 INVENTOR H15 ATTORNEY June 1 1926. r

L. E. BUDD GRATE STRUCTURE 4 Sheets-Sheet ,4'

INVENTOR 66k!" Z. 15 5M .Filed March 6, 1925 Fatentetl June 1, 192%.

cairn starts snare srnuotrunn Application filed; March 6, 1925. .Serial No. 13,433.

My invention relates to grate structures for boilers and its object is to provide a grate structure of simple construction, which may be operated by hand or power to evenly shift the coal bed from the feed to the ash .end of the grate surface.

This object, .and other. advantageous ends which will be described hereinafter, I attain in the following manner, reference being had tothe accompanying {drawings in which Figure 1 is a fragmentary central section through alfu r nace having my grate structure applied thereto,

Figure 2 an enlarged viewof the grate structure shown iniFigure 1, illustrating the grate sections in another position,

;Figure 3a view similar. to Figure 2showing theparts in .anotherposition,

Figure 4 a fragmentary.enlarged bottom plan view of they grate structure. shown in Figure 1, e

Figures 5 and 6 bottom plan views of grate sections made in accordance with my invention,

Figure 7 a fragmentary front view of thefurnace shown in Figure 1 illustrating the operating mechanism,

FigureS' a sideYview .of the. operating mechanism shown in Figure 7 :io Figure 9 aplan view ofthe mechanism shown in Figure Figure 10 an 'enlarged central section through a grate'bar unit which forms a part of my invention, and

Figure 11 a reduced fragmentary section .on line 1111 of Figure 1.

Referring to the drawings, 1 indicates a frame and 2 a series of grate bariunits pivotally mounted on the frame and ar- .rangechto form .an inclinedgrate surface. Each unit consists of a grate section 3 mounted on a pivotnrod 4 and adapted to swing in one direction, and a grate. section 5 mounted upon the same pivot rod but adapted to swing in reverse direction. Normally, the upper faces of grate sections 3 and 5 are flush with each otheigfhutsection 3 is adapted to.v be swungboth below and above the plane of the-grate surfacehndsec- -t -ion 5 is adapted to .be swung'rdownwardly from and upwardly tol butlnot ,qabove that plane. flhe grate; sectionseittend the width f of the mamasseuse an proviad aaaiui hubs my which itisjsuppo-rted onf i l i ""dagwith,

petrol-a eed-ha in r e at e5 Section?) is provided, onits face side with an arcuate guard plate 8 adapted toprevent coal from falling into the. ash pit when that section .is swung above the plane of the grate surface. Therfree side of section 5 may be formed with a series of spaced projections 11 which provide additional air I spaces, and its other side is provided with hooks 12. which take over-rod 1 and fit. be-

tweenthe hubs of section 3. Anarcuate part 13 between: liooks1l2 prevents coal from ,falling..between section 3 and the pivot rod when the sections are swung downwardly. Hubs Tand hooks 12 servehtohlnge the respective sectionsupon the pivot rods. One

ofthe hubs of section 3 has a depending arm 9 by which the section maybe actuated, and il llifllfl'n 14L depends fromsection 5v by. which that section may be actuated. The actuating arms are designed, to be moved concurrently but arm 9 is so. d sposed that movement. in

one directionwill move. secti0n 3 downwardly from its flush: positionand movement in the other direction will move it upwardly to and beyond'it's flush position, and arm 1a is so disposed that movementin one direction will move section 5 downwardly and movement in the other'direction will move it upwardly tobut not beyond its fiush position.

The downward movement of the grate sections permits the coal {to fall forward into the angles betwenQthe sections. vUpward movement first lifts the, coal out of the angles and restores thesections to their flush 'Iposition. Continued upward .movement of section 3 pushes the coal resting .upon that section onto section,5. rThe downaward movement of the succeedingunlt allows the c-oallon section?) to fall into another angle from which it is lifted and I p The coallbed is thus gradually shifted from the front to the rear 7 of the inclined grate without permitting, any materialpart of theunconsumed fuel to get to the ash pit.

;Movement maybe imparted to the grate sections by anysuitable mechanism. The ,simple operating-mechanismshown is designed for manual 0: easily. modified .for power operation. It l consists ofa frock {sh 7 ft .17

ation hhtgmay :be

. tie-h e ings in a bracket 18 ptdieob are ' ngaga' by nected with a link 19 which is pivotally connected with a tie bar 20 which is connected with arms 9 which depend from hubs 7 on grate sections 3. Arm 16 is in like manner connected with arms 14, depending from grate sections 5, through a link 21 and a tie bar Rock shaft 17 and arms 15, 16 and 24 constitute a rock lever and, by means of the connections above described serve to impart concurrent movement to the grate sections 3 and 5 for shifting the coal bed.

Inasmuch as the grate sections are supported on one side only, their weight and the weight of the coal will tend to swing the sections downwardly. To overcome this tendency, oounterbalancing means may be connected with rock shaft 17. As such means, I have shown a spiral spring 26 having one end fixed to bracket 18 and the other end to a collar 27 carried by rock shaft 17. The tension of the spring should be suflicient to normally counter-balance the downward pressure exerted by the grate sections and the coal thereon. This permits the grate sections to be actuated by pressure sufficient to overcome the friction, and the friction will normally hold the grate sections in whatever positions they may be when actuation of the lever stops, though it is desirable to also provide positive means for locking the sections in their flush position. For this purpose, I preferably provide a pair of ledges 28 on an extension 29 of bracket 18 to prevent the handle from being lifted off lug 24; until an ear 30 on the handle socket is in registry with the space 31 between the ledges. When the handle is in this position it may be lifted ofi and lug 24 looked in position by swinging abifurcated locking member 32, on extension 29, to partially embrace lug 24-.

In case a section 5 should burn out or become warped or defective in any manner, it may be removed by merely unhooking hooks 12 from pivot rod i, and replaced by a new bar.

It will be seen that with the grate structure above described, the coal bed may be easily and uniformly shifted along the grate surface.

While I have described my invention as taking a particular form, it will be understood that the various parts may be changed without departing from the spirit thereof, and hence I do not limit myself to the precise construction set forth, but consider that I am at liberty to make such. changes and alterations as fairly come within the scope of. the appended claims. I

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is g 1. In a grate structure, a transverse grate unit consisting of a pivot rod, a grate section hinged thereto and adapted to be swung to positions below and above the plane of the grate surface, a grate section hinged to the rod and adapted to swing below the plane of the grate surface only, and means for actuating the sectlons.

2. In an inclined grate structure, a series of transverse grate units, each consisting of a pivot rod, a grate section hinged thereto and adapted to be swung to positions below and above the plane of the grate surface, a grate section hinged to the rod and adapted to be swung to positions below the plane of the grate surface only, and means for actuating the sections.

8. In an inclined grate structure, a series of transverse grate units, each consisting of a pivot rod, grate sections hinged thereto and adapted to swing, the upper faces of the sections being normally flush with each other, one section adapted to be swung to positions below and above the plane of the grate surface and the other section to be swung to a position below the plane of the grate surface only, and means for actuating the sections.

4. In an inclined grate structure, a series of transverse grate units, each consisting of a pivot rod, grate sections hinged thereto and adapted to swing, the upper faces of the sections being normally flush with each other, one section adapted to be swung to positions below and above'the plane of the grate surface and the other section to be swung to a position below the plane of the grate surface only, means for counterbalancing the pressure of the coal and the grate sections, and means for actuating the sections.

5. In an inclined grate structure, a series of transverse grate units, each consisting of a pivot rod, grate sections hinged thereto and adapted to swing, the upper faces of the sections being normally flush with each other, one section adapted to be swung to positions below and above the plane of the grate surface and the other section to be swung to a position below the plane of the grate surface only, means for counterbalancing the pressure of the coal and the grate sections, means for actuating the sections, and means for locking them in their normal positions.

6. In a grate structure, a transverse grate unit consisting of a pivot rod, grate section hinged thereto and adapted to be swung to positions below and above the plane of the grate surface and having, an arcuate guard plate adapted, when the plate is swung above the plane of the grate, to prevent fuel from dropping into the ash pit, the other section being adapted to be swung below the plane of the grate surface only, and means for actuating the sections.

a 7. A transverse grate unit consisting of a pivot rod, a grate section having a hub pivoted on the rod, the section being adapted to be swung below and above the plane of the grate surface, a grate section having hooks taking over the rods, the section being adapted to be swung below the plane of the grate surface only, and means for swinging the sections.

8. A grate structure including a frame, a series of pivot rods mounted therein; a series of grate sections mounted upon the rods and adapted to swing to positions below and above the plane of the grate; a series of grate sections mounted upon the rods opposite the sections of the first series respectively and adapted to swing to positions below the plane of the grate, an arm depending from each section; a tie bar connecting the arms of each series of sections, and a rock shaft,

having an arm connected with each tie bar, whereby the respective series of grate sections may be actuated.

In testimony whereof I have signed my name to this specification.

LESTER E. BUDD. 

